Error correction process for synthetic aperture radar data

摘要

The method operates on data from aircraft-borne synthetic aperture radar (SAR) and uses the correlation adaptive frequency shift estimator (CAFE) system. Successive azimuth data (1, 2) over a given time period DELTA t is fed into a multiplier (3) to give the Doppler frequency transfer. The result is subject to fast Fourier transformation (4) to give real frequency transfer and make visible the shift of the sinc-function (6). The Doppler rate relates in time to the movement error. Thus by applying the same process and algorithm of correlation adaptation a picture of maximum detection (7) can be achieved and phase errors, leading to geometric distortion and poor resolution, in the same azimuth range can be detected and automatically corrected.